Respostas

2013-06-13T21:21:19-03:00

olá!!

 

an=24

n=30

r=6

a1=?

 

an=a1+(n-1).r

24=a1+(30-1).6

24=a1+29.6

a1=24-174

a1=-150

8 2 8
2013-06-13T22:46:20-03:00